305 results about "Rust" patented technology

The invention belongs to the technical field of manufacturing of low-alloy high-strength steel, and particularly relates to atmospheric corrosion resistant HC260LA low-alloy high-strength steel and a production method of the atmospheric corrosion resistant HC260LA low-alloy high-strength steel. 0.15% to 0.30% of Si; 0.40% to 0.60% of Mn; 0.06% to 0.10% of P; less than or equal to 0.015% of S; 0.02% to 0.08% of Al; 0.10% to 0.20% of Cu; 0 to 0.15% of Ti; 0 to 0.09 percent of Nb; 0.001% to 0.006% of N; and the balance of Fe and inevitable impurities. According to the method, the blocking effect of segregation of P-Cu elements on the grain boundary on a corrosion path is utilized, low-temperature rolling is combined, a three-dimensional corrosion-resistant system of fine grain strengthening, substructure strengthening and rust layer protection is constructed, and the weather resistance, the corrosion resistance and the mechanical property are jointly improved.

The invention discloses a surface corrosion-resistant invar alloy precision strip for a liquid cargo cabin of a liquefied natural gas carrier and a manufacturing method. The surface corrosion-resistant invar alloy precision strip comprises the following components: 35.6%-37.1% of Ni, 0.35%-0.80% of Si, 0.05%-0.10% of Ce, 0.015%-0.030% of C, less than or equal to 0.35% of Mn, 0-0.0008% of O, less than or equal to 0.01% of N, less than or equal to 0.003% of S, less than or equal to 0.005% of P, less than or equal to 0.20% of Cr, less than or equal to 0.20% of Cu, less than or equal to 0.05% of Al, less than or equal to 0.003% of Ti and the balance of iron and inevitable impurity elements. According to the formula, through EAF, AOD, LF, continuous casting or die casting, hot continuous rolling or solid solution pickling after forging, cold rolling in multiple rolling processes, annealing and protective film prefabrication treatment, the temperature range of the prepared material is about 1.5-1.8 * 10 <-6 > / DEG C from-163 DEG C to 20 DEG C, the yield strength Rp0.2 value is larger than or equal to 300 MPa, the tensile strength Rm value is larger than or equal to 480 MPa, the ductility A50 is larger than or equal to 35%, surface corrosion does not occur within the machining period or storage and transportation time of 15 days under the conventional condition, and the service life of the material is prolonged. And particularly, the risk of surface rusting in the processing, storage and transportation processes is greatly reduced.

The invention discloses a metal bent pipe cutting technology which comprises the steps of surface rust removal of the surface of a cutting raw material, fixing of the metal cutting raw material, simultaneous cutting of the two ends and waste treatment. The top of the mounting base is connected with a clamping angle adjusting assembly, one side of the clamping angle adjusting assembly is connected with a synchronous cutting assembly for cutting from the two ends of a metal bent pipe at the same time, the angle position of the clamping angle adjusting assembly is adjusted according to the radian of a metal pipe, and the metal bent pipe can be cut through the synchronous cutting assembly; the two ends of the metal pipe fitting are synchronously cut, the situation that the two ends of the metal pipe fitting are cut twice is reduced, the risk of scalding in the cutting process is avoided, and meanwhile in the process that the two ends are cut at the same time, the risk that cutting scraps adhere to the inner wall in the cutting process of the two ends is reduced.

The invention relates to the technical field of flux-cored wires, and discloses a high-rust-resistance flux-cored wire preparation method which comprises the following steps of S1, raw material pretreatment, S2, powder adding and forming, S3, surface modification and S4, finished product inspection. Before work is started, a worker prepares raw materials including high-carbon ferrochrome, tungsten carbide, boron carbide, rare-earth metal oxide and ferromolybdenum powder, then grinding equipment is used for grinding the raw materials, then the ground powder is dried for 2-3 hours through equipment at the temperature of 100-150 DEG C, the dryness of the raw materials is guaranteed, and the raw materials are evenly mixed. The method comprises the following steps: firstly, preparing a flux-cored wire, then uniformly stirring by utilizing three-dimensional mixing equipment, and then mixing and proportioning according to different proportions according to a corrosion-resistant flux-cored wire, an acid-base-resistant flux-cored wire and a high-hardness high-temperature-resistant flux-cored wire, so that the welding wires with corresponding properties can be conveniently used according to different environments, and the maximization of the functionality of the welding wire is improved.

The invention discloses a valve body workpiece composite deburring method which comprises the steps that an AGV transfer trolley transfers a valve body workpiece to a rough cleaning machine, and scrap iron and cutting fluid on the surface and an inner cavity of the valve body workpiece are flushed and removed through cleaning fluid in the rough cleaning machine; after rough cleaning, the valve body workpiece is transferred to a deburring workbench for manual deburring; the valve body workpiece subjected to manual deburring is transferred to an endoscopic table, and scrap iron in an inner cavity of the valve body workpiece is inspected and removed through an endoscope; the valve body workpiece subjected to endoscopy enters a high-pressure cleaning machine through the roller way for high-pressure cleaning; the valve body workpiece subjected to high-pressure cleaning enters a heat energy explosion automatic roller line, is overturned by an overturning tool and then is fed into a heat energy explosion machine through a mechanical arm, and burrs are changed into metal oxidation powder through heat energy explosion combustion; and the valve body workpiece subjected to heat energy explosion combustion enters a derusting cleaning machine, and metal oxidation powder is removed through acid pickling. Mechanical deburring, high-pressure deburring and heat energy deburring are integrated, and the quality of a valve body workpiece is improved.

The utility model provides a reinforcing steel bar straightening device which comprises a straightening machine, two ends of the straightening machine are respectively provided with an inlet and an outlet for a reinforcing steel bar body to enter and exit; the rust removal unit comprises a mounting cylinder mounted at the outlet end of the straightening machine and a rotating cylinder rotationally arranged in the mounting cylinder, and a polishing piece is detachably arranged in the rotating cylinder and used for polishing the steel bar body; the driving unit is arranged on the straightening machine and is in transmission connection with the rotating cylinder, and the driving unit is used for driving the rotating cylinder to rotate; the collecting unit is arranged at the bottom of the straightening machine and used for collecting iron rust powder; according to the steel bar straightening machine, the rust removal unit is arranged on the straightening machine, a steel bar to be straightened enters the straightening machine from the inlet of the straightening machine to be straightened, then penetrates out of the outlet end and penetrates through the rotating grinding piece in the rust removal unit, the grinding piece rotates to grind and remove rust on the straightened steel bar, and therefore rust can be removed in the steel bar straightening process at the same time; the problem that the strength and durability of the steel bars are reduced due to the fact that rust treatment on the surfaces of the steel bars is neglected during straightening is solved.

The application discloses a kind of high-altitude area weathering bridge steel member rust layer stabilizing treatment agent and use method, mainly solve the rust layer of high-altitude area weathering bridge steel member is difficult to stabilize and surface rust layer color is not uniform, rust liquid flow and other problems.The stabilizing treatment agent is composed of fast rusting agent and rust layer stabilizer, the fast rusting agent is composed of ferric chloride, copper sulfate, hydrogen peroxide, ethylene glycol and deionized water, the rust layer stabilizer is composed of sodium polyphosphate, sodium bisulfite and methanol and deionized water.The treatment agent of the application is suitable for the harsh environment of low temperature, oxygen is rare, inorganic salt system treatment agent is prone to icing in high sea area, the surface of high-altitude area weathering bridge steel member after processing forms brown rust layer with uniform color, no rust liquid flow.The rust layer of weathering bridge steel member can be stabilized within 8 hours by using the application, the thickness of the rust layer after processing is greater than or equal to 50 μm, the surface rust layer color difference value ΔE of different parts of the component is less than or equal to 10, and the amount of surface rust layer of the component is greater than or equal to 15 g / m 2 .

The application discloses a kind of prediction methods of high-strength steel wire high temperature creep behavior of rust, belong to bridge cable safety assessment technical field.The method is first obtained by test the material intrinsic material parameters of rust high-strength steel wire test piece and un-rust high-strength steel wire test piece;Then three-dimensional scanning quantization corrosion morphology is used, the maximum pit depth of rust high-strength steel wire surface and the pit root radius of pit bottom are extracted, and then the stress concentration coefficient and the effective bearing area decay function after net section loss are calculated, and the corrosion damage index is introduced;On this basis, the creep strain rate prediction model considering local stress concentration, section loss and material damage is established.The prediction method of the application realizes the quantitative prediction from pit micro-morphology to macro creep behavior, and has great engineering application value for evaluating the safety and residual life of in-service bridge cable.

This invention discloses a corrosion-resistant and rust-proof bearing ring applied in the field of bearing technology. By setting a magnetic sealing unit at the end of the ring shaft, multiple sealing layers can be formed between the rotating shaft and the bearing end, effectively intercepting external dust, water stains, etc. from entering between the inner ring and the rotating shaft. This effectively avoids the impact of dust, water stains, etc. on the inner wall of the ring. Compared with the existing technology that only uses an interference fit, it effectively eliminates the micro-gap between the two, reduces fretting corrosion, and improves the bearing's rust prevention effect. Through the setting of a monitoring and control unit, the magnetic fluid used for sealing can be monitored, which facilitates timely detection of its radial outward movement under the action of centrifugal force. This allows the operator to replenish the magnetic fluid in a timely manner, effectively avoiding the deterioration of the sealing effect due to magnetic fluid loss and improving the corrosion resistance and rust prevention effect.

The invention relates to the technical field of metal composite materials, in particular to high-conductivity low-cost copper-iron composite powder and a full-coating preparation method thereof.The two steps of chemical copper plating and 450-600 DEG C heat treatment are combined, micro-pores in an initial copper layer are diffused and healed by atoms, a compact copper shell is formed, the surface of the composite powder is free of red rust after a test, and the copper-iron composite powder is high in conductivity and low in cost. The corrosion resistance is improved compared with that of a non-heat-treated sample; a 0.5-3 m mutual diffusion layer is formed on the copper-iron interface through heat treatment, metallurgical bonding is achieved, the interface shear strength is improved to be larger than or equal to 25 MPa from less than 10 MPa of traditional physical bonding, and the problem that a coating layer is prone to stripping in the subsequent pressing, sintering or using process is solved.

The present invention provides a water-based surface preparation agent composition that combines paint film stripping and rust removal properties. [Solution] This is a surface preparation agent composition for removing rust along with the existing paint film when repainting an existing paint film applied to existing steel materials. It contains at least benzyl alcohol, a hydroxy acid, and water. The hydroxy acid is citric acid, malic acid, or an acidic salt thereof. Furthermore, it contains hydroxyethyl cellulose as an emulsifier for benzyl alcohol. The pH is preferably 4.0 to 6.0. This water-based surface preparation agent composition is applied to the existing steel material to remove rust along with the existing paint film.

A biodegradable adhesive composite comprising a biobased polyurethane matrix synthesized from sesame seed oil and a magnetically susceptible filler made from recycled iron rust. The composite enables reversible bonding of various substrates including glass, metal, polymer, and wood. Upon exposure to an oscillating magnetic field of approximately 0.0176 T, the adhesive melts due to hysteresis heating of the filler, enabling clean and rapid debonding within about four minutes. The composite retains adhesive performance through at least 11 bonding-debonding cycles and supports ecofriendly, recyclable applications without the need for primers or specialized substrates. The system offers a sustainable alternative to conventional adhesives for temporary and reusable joint applications.

An oil-well metal pipe according to the present disclosure includes a resin coating on or above at least one of a pin contact surface and a box contact surface. The resin coating contains: a resin: 50.0 to 99.5 mass %, a wax: 0 to 10.0 mass %, a fluorine-based additive: 0 to 30.0 mass %, graphite: 0 to 10.0 mass %, a rust preventive pigment: 0 to 30.0 mass %, a coloring pigment: 0 to 10.0 mass %, a coupling agent: 0 to 10.0 mass %, and one type or two types selected from a group consisting of a magnesium silicate hydroxide powder: 1.5 to 50.0 mass % and TiO2: 0.5 to 30.0 mass %; and satisfies Formula (1).(W+F+G) / (M+T)≤5.00  (1)

This invention relates to the field of iron and steel metallurgy and proposes a method for controlling the corrosion-resistant iron oxide scale on the surface of hot-rolled steel plates. The method includes the following steps: First, molten steel is smelted and cast into steel billets; then, the steel billets are heated to 550-600℃ and held at an air-fuel ratio of 1.1-1.3 for 20-30 minutes; subsequently, the temperature is raised to 1100-1150℃ and held at an air-fuel ratio of 1.0-1.1 for 40-60 minutes; finally, the temperature is raised to 1180-1220℃ and held at an air-fuel ratio of 0.9-1.0 for 20-30 minutes to obtain the heated steel billet; the heated steel billet is then hot-rolled and cooled to obtain the steel plate. This technical solution solves the problems of uneven iron oxide scale growth and poor adhesion to the matrix in related technologies.

The waste gas treatment device comprises an outer iron sheet box, the right side of the outer iron sheet box is provided with a shot blasting machine waste gas filtering air inlet facilitating waste gas entering, the left side of the outer iron sheet box is provided with a fixing frame, an air blower and a shot blasting machine waste gas filtering air outlet, and multiple layers of fine-mesh filtering cotton are arranged in the outer iron sheet box. The device is simple and reasonable in structure, waste gas can be subjected to layered filtering treatment, the waste gas filtering efficiency is improved, the waste gas filtering efficiency and the production progress are kept synchronous, iron rust, rust removal steel shots and other solid dust impurities in the waste gas are precisely classified and recycled, and waste resource utilization is promoted.

This invention relates to the field of steel structure rust removal technology, and discloses a negative pressure dust removal method and device for high-altitude steel structure rust removal operations, comprising the following steps: acquiring process parameters and rust characteristic information before laser rust removal operations, and calculating the predicted dust generation amount based on the process parameters and rust characteristic information using a preset dust generation rate prediction model; determining the initial negative pressure setpoint and the initial speed of the dust removal fan according to the predicted dust generation amount, and controlling the dust removal fan to operate according to the initial negative pressure setpoint and the initial speed of the dust removal fan to establish an initial negative pressure field; during the laser rust removal operation, acquiring image data inside the dust removal hood in real time, and analyzing the image data using a deep learning algorithm to identify the dust distribution state and diffusion trend; adjusting the operating parameters of the dust removal fan in real time according to the identified dust distribution state and diffusion trend results to dynamically match the current dust generation state.

The application discloses a production method for controlling the thickness of iron oxide scale of free-cutting steel, and the process steps are as follows: hot metal pretreatment, converter steelmaking, CAS treatment, LF furnace external refining, continuous casting, heating furnace heating, rolling, controlled cooling, coil collecting and finished product inspection. The composition and thickness of the surface iron oxide scale of the free-cuting steel wire rod are controlled by controlling the wire drawing temperature and the post-rolling cooling speed, the wire drawing temperature is ensured to be below 860 DEG C by adjusting the water amount of the water tank after the finishing mill, the Fe2O3 red rust is generated on the surface of the wire rod, and the proportion of Fe3O4 in the iron oxide scale on the surface of the wire rod is prevented from being increased due to the excessively high wire drawing temperature. The wire drawing temperature and the post-rolling cooling speed are controlled in the application, the red rust-like iron oxide scale is formed on the surface of the free-cutting steel wire rod, the thickness of the iron oxide scale on the surface of the free-cutting steel wire rod is controlled to be below 12 microns, the inclusions and the banded structure are uniformly distributed, and the application is suitable for producing the free-cutting steel with the specifications of 6.5-17 mm and S=0.28%-0.40%.

The application discloses a rust-proof enhancer for PAG quenching liquid, and raw materials of the rust-proof enhancer include the following components in parts by weight: 40-45 parts of organic-inorganic rust-proof additive, 35-40 parts of pH regulator, 5-10 parts of non-ferrous metal rust-proof agent and 5-10 parts of antibacterial agent; the organic-inorganic rust-proof additive is a mixture of dicarboxylic acid, tricarboxylic acid, phytic acid, isomeric decanoic acid, fatty acid amide or fatty acid amine salt and sodium tungstate; the components synergistically generate a stable rust-proof film on the surface of metal, the rust-proof film has strong adhesion and can be firmly attached to the surface of metal, is less affected by the polarity of PAG, can effectively enhance the rust-proof performance of steel workpieces after quenching, and has no adverse effect on the properties such as the cloud point, viscosity, foam and cooling characteristics of the quenching liquid.

The invention relates to the technical field of antirust coatings, in particular to a water-based environment-friendly antirust coating for a metal surface and a preparation method of the water-based environment-friendly antirust coating. The water-based environment-friendly antirust coating is prepared from the following raw materials in parts by weight: 35 to 45 parts of a novel water-based polyurethane solution, 13 to 17 parts of novel nano cellulose, 15 to 20 parts of an antirust pigment, 3 to 6 parts of silicon dioxide, 1.5 to 2.5 parts of a dispersing agent, 0.5 to 1.5 parts of a defoaming agent, 1.5 to 2.5 parts of a thickening agent, 2 to 4 parts of diethylene glycol butyl ether and 15 to 20 parts of deionized water. The water-based environment-friendly anti-rust coating is an environment-friendly high-performance coating, metal protection is achieved through the synergistic effect of physical barriers and chemical protection, a compact and continuous organic coating is formed on the metal surface, moisture, oxygen and corrosive media are effectively isolated, an electrochemical corrosion path is blocked, anti-rust pigment migrates to a metal interface in the coating, and the anti-rust effect is good. A chemical reaction with an iron matrix is carried out to generate an indissolvable passive film, so that the cathode reaction is inhibited and the corrosion rate is reduced.

The invention discloses a nano sherardizing rotary ball-milling surface treatment method and a metal workpiece treated by the method, and the method specifically comprises the following steps: degreasing, derusting and drying the metal workpiece, proportionally filling the workpiece, a ball-milling agent and a nano composite sherardizing agent into a space, vacuumizing or filling protective gas, rotating and heating to 350-420 DEG C, preserving heat for 1-4 hours, cooling and separating the workpiece to obtain the nano sherardizing rotary ball-milling surface treatment method. And passivating if necessary. According to the method, a uniform zinc-iron alloy layer with the thickness of 20-50 microns is formed through the synergistic effect of mechanical energy, heat energy and chemical energy, the zinc-iron alloy layer is resistant to salt mist for more than 1000 hours, red rust and hydrogen embrittlement are avoided, energy consumption is low, pollution is small, a zinc impregnation agent and ball milling can be recycled, and the long-acting corrosion prevention requirements of metal parts in the fields of high-speed rails, ocean engineering and the like can be met.

The present application relates to a kind of cleaning agent for coating pretreatment and its preparation method, belong to cleaning agent technical field.The present application discloses the cleaning agent for coating pretreatment includes the following weight parts raw materials: rust inhibitor 3-6 parts, corrosion inhibitor 0.1-1 part, brightener 5-10 parts, new surfactant 5-20 parts, modified silane coupling agent 0.1-2 parts, defoaming agent 0.1-1 part, water 20-30 parts.Brightener can reduce the roughness of metal surface increase luster and enhance the cleaning effect, cooperate with corrosion inhibitor to keep the luster of metal surface.Silane coupling agent has the effect of reducing surface tension to improve decontamination capacity, by nano metal particles to modify silane coupling agent, form silicon oxide film with reducibility on metal surface during cleaning.The present application can prepare the cleaning agent with good cleaning effect and corrosion resistance.

The invention discloses a high-precision high-strength durable bevel gear machining process which comprises the following steps: S1, putting raw materials for manufacturing a blank into a 260T forming press, performing compression molding by using the forming press to obtain a blank piece, and taking out the blank piece for later use; s2, the raw materials for manufacturing the copper infiltration block are subjected to compression molding through a molding press; s3, high-temperature sintering is conducted on the blank piece and the copper infiltrated block, and a copper infiltrated blank is sintered in a nitrogen-based atmosphere; s4, the copper infiltrated blank obtained in the S3 is soaked in anti-rust oil, and the outer diameter, the inner diameter and the height size are subjected to subsequent finish turning; and S5, the workpiece obtained in the S4 is machined, rough gear hobbing, deburring and gear grinding are conducted in sequence, and a final finished product is obtained. The novel powder metallurgy process is adopted, the efficiency is improved by 40%, the material utilization rate is 95%, the energy consumption is reduced by 50%, the density of the obtained product can reach 7.5 g / cm < 3 >, the precision is 0.004 mm, the product can bear large loads without cracking, the hardness can reach HRC15-30 without heat treatment, the precision is high, the noise is low, the strength is high, and durability is achieved, and meanwhile the running noise can be reduced through the middle clearance shape.

The invention provides an anti-rust infiltration method and equipment, and relates to the field of anti-rust infiltration, and the anti-rust infiltration method comprises the following steps: putting an anti-rust liquid into an infiltration tank, and carrying out heat exchange around the infiltration tank through a heat exchange medium; presetting a heating temperature, heating the heat exchange medium at a constant temperature, and maintaining the antirust liquid at the preset heating temperature; putting the iron product into a soaking tank; the infiltration time is preset, and the iron product is oscillated up and down in the anti-rust liquid within the preset infiltration time; and after oscillation is completed, the iron product is fished out of the infiltration tank, and the anti-rust liquid on the surface of the iron product is drained off. The antirust liquid can solve the problem that the antirust liquid in the prior art has the optimal use temperature, so that the antirust effect of a coated ironwork is possibly poor in a cold environment; and constant-temperature infiltration of the iron product is realized.

The application provides a low oil absorption amount rust and corrosion preventing powder body and a preparation method thereof, and belongs to the technical field of pigments. Nano silicon dioxide is modified by a calcium salt and a silane coupling agent to obtain silicon dioxide pigment fine powder; calcium ion type silicon dioxide pigment is modified by hyperbranched polysiloxane to obtain modified calcium ion type silicon dioxide pigment; iron tripolyphosphate is modified by tannic acid to obtain modified iron tripolyphosphate, which is uniformly mixed with the silicon dioxide pigment fine powder and the modified calcium ion type silicon dioxide pigment to obtain the low oil absorption amount rust and corrosion preventing powder body. The powder body has good rust and corrosion preventing performance, the wettability, the compatibility and the dispersibility of the pigment in paint are improved, the mechanical properties of the composite pigment are improved, the oil absorption amount is greatly reduced, and the powder body has a good application prospect.

The invention relates to the field of bridge pier construction, and discloses a bridge pier body main reinforcement treatment device which comprises a treatment box body, a liquid cavity is formed in the treatment box body, at least one workpiece conveying component is arranged on each of the two sides of the treatment box body, and the workpiece conveying components on the two sides are coaxial and used for conveying workpieces; the fixed circular ring and the movable circular ring are arranged on a workpiece path; compared with the prior art, the device aims at solving the problems that rust powder is scattered, rib crack residues are left, secondary attachment is difficult to clean and the like in the process of cleaning a rust layer on the surface of a steel bar on a bridge pier construction site, liquid is supplied to the inner wall through small holes of a fixed circular ring, a continuous flowing water film is formed, the outer surface of a workpiece is pre-wetted, and a particle trapping interface is obtained; therefore, the dust raising and re-attachment of the dry brush are reduced; and secondly, the movable circular ring swings back and forth to drive the steel brush to sweep circumferentially, so that the rust layer is repeatedly disturbed and stripped in different tangential directions, and the blind area is reduced.

The invention relates to the technical field of hydraulic protection, in particular to a deep learning hydraulic metal structure corrosion detection method which comprises the following steps: S1, pretreatment: preparing an anti-rust coating, a fluorescent agent and a comprehensive treatment device, and preparing a mixing agent; a comprehensive treatment device is used for moving on the hydraulic metal surface, and meanwhile a mixing agent is smeared; a comprehensive processing device is used for collecting the hydraulic metal surface image smeared with the mixing agent, and an initial image is obtained; s2, fluorescence reflection detection and corrosion analysis, wherein in the using process of the hydraulic metal, a comprehensive treatment device is used for moving on the surface of the hydraulic metal; meanwhile, a comprehensive processing device is used for collecting a current hydraulic metal surface image, and a current image is obtained; and S3, rusting treatment: after the comprehensive treatment device judges the rusted area, the comprehensive treatment device scrapes rusted objects on the surface of the area and stores the rusted objects. According to the invention, the corrosion detection efficiency can be effectively improved.

The invention belongs to the technical field of metal material processing, and discloses a cold rolling method for overcoming brittle fracture of non-oriented silicon steel for a new energy automobile, which comprises the following steps: S1, normalizing treatment: heating at 920-1000 DEG C for 2.5-4 minutes; s2, pickling treatment: pickling in an acidic aqueous solution, then soaking in a clean water tank, neutralizing with an alkaline aqueous solution, blow-drying and coating oil to prevent rusting; s3, heating treatment is conducted, specifically, the workpiece is placed in a box-type resistance furnace, and heat preservation is conducted for 20-120 min under the condition of 200-500 DEG C; s4, cold rolling is conducted, specifically, hot rolling is rapidly conducted on a cold-rolling mill; and S5, continuous annealing is conducted, specifically, continuous annealing is conducted at the strip steel speed of 85 m / min to 95 m / min, and the annealing soaking temperature is 920 DEG C to 1000 DEG C. The technical problem that when silicon steel cold rolling is carried out in a laboratory environment, the edge of a cold-rolled plate is cracked or brittle fracture occurs is solved.

The invention belongs to the technical field of concrete materials, and particularly relates to corrosion-resistant concrete for shield tunnel segments and a preparation method of the corrosion-resistant concrete. The concrete comprises sulphoaluminate cement, fly ash, slag powder, machine-made sand, gravel, a polycarboxylate superplasticizer, a defoaming agent, water and two key modified components, wherein the two key modified components comprise a layered double hydroxide-aluminum silicate nanosheet compound and a phosphate radical intercalation modified strontium molybdate slow-release corrosion inhibitor. During preparation, firstly, all the dry materials are put into a stirrer for dry mixing, then water and the additive are added for stirring to obtain mixed slurry, and a finished product is obtained after pouring, vibrating and steam curing. Wherein the two modified compounds are synthesized through a specific process, the former can adsorb corrosive ions and refine pores, and the latter can slowly release corrosion-inhibiting ions to protect reinforcing steel bars. The prepared concrete has excellent chloride ion penetration resistance, sulfate erosion resistance and carbonization resistance, the durability is remarkably improved, and the concrete is particularly suitable for shield tunnel segments in the severe corrosion environment.

The application discloses a method for preparing iron phosphate from rust iron, and relates to the technical field of resource recycling and comprehensive utilization. The method comprises the following steps: taking rust iron as an iron source to carry out purification and chemical reaction, preparing a high-purity iron solution, and then reacting the iron solution with a phosphate to prepare iron phosphate. Specifically, the method comprises the following steps: (1) acid immersion and filtration; (2) oxidation of the iron solution; (3) iron precipitation by adding phosphorus; (4) filtration and washing; (5) heat preservation and crystallization; and (6) high-temperature calcination. The method widens the recycling and utilization channels of rust iron resources, and enriches the preparation paths of iron phosphate. The method overcomes the problem of calcium-containing solid generation in the rust iron resource utilization process. Compared with common iron resource utilization processes for preparing iron phosphate, the preparation process of the application is short and simple to operate, and the efficient utilization of rust iron resources is realized to prepare high-economic-value iron phosphate.

A ombre effect transitioning from a deep rust at the bottom to pink at the top